Dynamo action at low magnetic Prandtl numbers: mean flow versus fully turbulent motions

被引：39
|
作者：
Ponty, Y.
Mininni, P. D.
Pinton, J-F
Politano, H.
Pouquet, A.
机构：
[1] Observ Cote Azur, Lab Cassiopee, CNRS, UMR6202, Nice 04, France
[2] Natl Ctr Atmospher Res, Boulder, CO 80307 USA
[3] Ecole Normale Super, CNRS, UMR5672, Phys Lab, F-69007 Lyon, France
来源：
NEW JOURNAL OF PHYSICS | 2007年 / 9卷
基金：
美国国家科学基金会;
关键词：
D O I：
10.1088/1367-2630/9/8/296
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We compute numerically the threshold for dynamo action in Taylor Green ( TG) swirling flows. Kinematic dynamo calculations, for which the flow field is fixed to its time average, are compared to dynamical runs, with the Navier-Stokes and induction equations jointly solved. The dynamo instability for the kinematic calculations is found to have two branches. The dynamical dynamo threshold at low Reynolds numbers lies within the low branch, while at high Reynolds numbers it gets closer to the high branch. Based on these results, the effect of the mean flow and of the turbulent fluctuations in TG dynamos are discussed.
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页数：11
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